Config.in: remove duplicate KERNEL_PERF_EVENTS symbol

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

SVN-Revision: 37222

Config.in

@@ -448,13 +448,10 @@ menu "Global build settings"
 			  the kmem extension can use it to guarantee that no group of processes
 			  will ever exhaust kernel resources alone.
 
-		config KERNEL_PERF_EVENTS
-			bool
-			default y if KERNEL_CGROUP_PERF
-
 		config KERNEL_CGROUP_PERF
 			bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
 			default n
+			select KERNEL_PERF_EVENTS
 			help
 			  This option extends the per-cpu mode to restrict monitoring to
 			  threads which belong to the cgroup specified and run on the